Hi Nova,
I'm on 26220.7070 and Notepad opens fine from
Run or the Start menu.
Have you tried Repair, Reset etc. from Settings?
Notepad fails to launch from Win+R ("notepad") due to missing Microsoft.UI.Windowing.Core.dll (Windows 11 Insider Dev 25H2 build 26220.7052)
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(137.6, 34%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EN%3C/text%3E%3C/svg%3E)
Nova
20
Reputation points
Hi,
When I press Win + R, type notepad, and hit Enter, I get this error message:
The code execution cannot proceed because Microsoft.UI.Windowing.Core.dll was not found. Reinstalling the program may fix this problem.
However:
Running C:\Windows\notepad.exe directly works perfectly.
Opening Notepad from the Start menu also works fine.
The problem only happens when launching Notepad via Win + R (or the notepad command).
This makes me think the modern UWP version of Notepad (WinUI 3) is missing a dependency or has a broken link to the Windows App SDK, while the legacy executable still works.
Steps I have tried:
Reinstalled Notepad using:
dism /online /add-capability /capabilityname:Microsoft.Windows.Notepad~~~~0.0.1.0
- Ran:
sfc /scannow DISM /Online /Cleanup-Image /RestoreHealth
None of these solved the issue.
Could you please confirm if this is a known issue in the Dev Channel build 26220.7052, or provide guidance on how to reinstall or restore the missing Microsoft.UI.Windowing.Core.dll / Windows App SDK runtime?
System Info:
Edition: Windows 11 Insider Preview 25H2 (Build 26220.7052)
Channel: Dev
Architecture: x64
Notepad version: UWP (Microsoft Store)
Thanks a lot for your help!
Windows Insider program | Windows Insider preview | Other
-
Nova 20 Reputation points
2025-11-10T15:55:12.86+00:00 Thanks for the answer, but how can I reinstall Windows App SDK? I don't know how to reinstall it?
-
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(57.599999999999994, 18%, 15%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDM%3C/text%3E%3C/svg%3E)
Dragon Mc Fly 20 Reputation points2025-12-05T16:19:43.9666667+00:00 I had the same problem and the only thing that solved the problem was delete notepad at
Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\App Paths
(see: https://www.reddit.com/r/techsupport/comments/143v4gy/cant_launch_notepad_from_the_run_prompt/) -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(73.60000000000001, 11%, 17%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMV%3C/text%3E%3C/svg%3E)
Marcel van den Bosch 0 Reputation points2026-02-13T09:37:59.8266667+00:00 The solution mentioned by Dragon Mc Fly worked for me!
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CrazyKats 19,245 Reputation points Volunteer Moderator2025-11-10T16:20:19.9333333+00:00 -
AI answer
2025-11-10T15:46:18.6266667+00:00 It appears that you are encountering an issue with launching the UWP version of Notepad via the Win + R command in Windows 11 Insider Dev Channel (Version 25H2, Build 26220.7052). The error message regarding the missing
Microsoft.UI.Windowing.Core.dllsuggests that there may be a dependency issue with the modern version of Notepad, which is likely linked to the Windows App SDK.Since you have already tried reinstalling Notepad and running system checks like
sfc /scannowandDISM, here are a few additional steps you could consider:- Check for Windows Updates: Ensure that your system is fully updated, as newer builds may contain fixes for known issues.
- Reinstall Windows App SDK: If the UWP version of Notepad is dependent on the Windows App SDK, reinstalling or repairing the SDK might resolve the issue.
- Feedback Hub: Since you are on the Insider build, consider reporting this issue through the Feedback Hub app. This can help Microsoft identify and address the problem in future updates.
- Registry Check: Double-check the registry settings related to the UWP apps to ensure there are no misconfigurations affecting the launch of Notepad.
As this is a known issue in the Dev Channel, it may be resolved in subsequent updates, so keeping your system updated is crucial.
References:
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